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I've seen occasions when something in the suction side of the venturi is blocked, and you can simply place your gloved finger over the ceramic nozzle opening and trigger the gun. This forces air to go back down through the suction hose and should clear any blockage. Of course, can't say for sure that is the problem, but it's always the first thing I do when the gun stops and I know I have media and air.
X2 Beat me to it